Portable light therapy device



FIG. 1 is an isometric view of a portable light therapy device according to my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

The broken lines illustrate portions of the portable light therapy device that form no part of the claimed design. 

CLAIM The ornamental design for a portable light therapy device, as shown and described. 